Fuel

Fuel is made by putting Oil through a Refinery. Fuel is used to Power combustion engines and can be stored in tanks or buckets. Refining Oil is worth it, as Fuel lasts 7.5 times longer in combustion engines than Oil. Fuel is the most efficent way of running a Combustion Engine , but keep in mind cooling the engine, or else the wonderful efficient Quarry setup that took you 5 hours to build will be no more!